linux-kernel - Re: OOM when adding ipv6 route: How to make available more per-cpu memory?

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Message-ID: <4CD58B9C.2030006@candelatech.com>
Date:	Sat, 06 Nov 2010 10:08:44 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	NetDev <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>
Subject: Re: OOM when adding ipv6 route:  How to make available more per-cpu
 memory?

On 11/06/2010 12:26 AM, Eric Dumazet wrote:
> Le vendredi 05 novembre 2010 à 17:07 -0700, Ben Greear a écrit :
>
>> We just tried creating 1000 macvlans with IPv6 addrs on a 64-bit machine
>> with 12GB RAM.  Only around 520 interfaces properly set their IPs, and
>> again there are errors about of-of-memory from 'ip', but no obvious
>> splats in dmesg.
>>
>> 'top' shows 10G or so free.
>>
>> It will take some time to figure out what exactly is returning
>> the ENOMEM....
>
> At least, nothing to do with percpu stuff ?

At least I don't see any percpu dumps in dmesg.  I vaguely remember
someone posting some ipv6 address scalability patches some time back.
I think they had to hack on /proc fs as well.  I'll see if I can
dig those up.

> Make sure udev / hotplug is not the problem, if you create your devices
> very fast.

We can create the macvlans w/out problem, though I'm sure that could
be sped up.  The problem is when we try to add IPv6 addresses to
them.

Thanks,
Ben


-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com
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